[ADD] survey_record_generation : migrate from 16 to 18

survey_record_generation/readme/CONTEXT.rst

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+In several cases we want to use survey application to create records. 
+Website form application give the same possibility but the design is integrated on the web site. 
+Futhermore this module add other functionnalities like "duplicate" check, or creation of several interconnected records
+
+Typical use case : Information request form
+
+#. Submitting the form will create a contact (partner) only if it does not already exist in the database.
+#. Submitting the form will also create a crm opportunity linked to previously created partner
+
+